0
我创建了一个图像编辑应用程序。我想给用户一个选项，他可以在运行时捕捉图像，并对捕捉的图像应用编辑效果。目前我正在按照Advanced Photo Capture for windows Phone 8的说明进行操作。从PhotocaptureDevice捕获照片
有两个问题 首先，我面临的是，当我点击捕获按钮时，捕获的图像将是一个倒置的图像。如果我将手机置于横向模式，则会拍摄正确的照片。
当应用程序启动时，屏幕上没有任何内容，换句话说它是全黑的。我想让屏幕显示相机视图，以便用户知道他将要捕捉的内容。
下面是我对Mainpage.xaml.cs文件和MainPage.xaml文件的代码。
namespace CapturingPhoto {
public partial class MainPage : PhoneApplicationPage {
private MemoryStream imageStream;
private PhotoCaptureDevice captureDevice;
private CameraCaptureSequence seq;
// Constructor
public MainPage() {
InitializeComponent();
imageStream = new MemoryStream();
// Sample code to localize the ApplicationBar
//BuildLocalizedApplicationBar();
prepareResouceToCapture();
}
private async void prepareResouceToCapture() {
if((!PhotoCaptureDevice.AvailableSensorLocations.Contains(CameraSensorLocation.Back)) &&
(!PhotoCaptureDevice.AvailableSensorLocations.Contains(CameraSensorLocation.Front))){
return;
}
Windows.Foundation.Size size;
if(PhotoCaptureDevice.AvailableSensorLocations.Contains(CameraSensorLocation.Back)){
IReadOnlyList <Windows.Foundation.Size> avalaibleSizeList =
PhotoCaptureDevice.GetAvailableCaptureResolutions(CameraSensorLocation.Back);
size = avalaibleSizeList[0];
this.captureDevice = await PhotoCaptureDevice.OpenAsync(CameraSensorLocation.Back, size);
}
else{
IReadOnlyList<Windows.Foundation.Size> avalaibleSizeList =
PhotoCaptureDevice.GetAvailableCaptureResolutions(CameraSensorLocation.Front);
size = avalaibleSizeList[0];
this.captureDevice = await PhotoCaptureDevice.OpenAsync(CameraSensorLocation.Front, size);
}
// await this.captureDevice.SetCaptureResolutionAsync(size);
// await this.captureDevice.SetPreviewResolutionAsync(size);
// BackgroundVideoBrush.SetSource(this.captureDevice);
}
private async void onCaptureImage(object sender, RoutedEventArgs e) {
seq = captureDevice.CreateCaptureSequence(1);
captureDevice.SetProperty(KnownCameraPhotoProperties.FlashMode, FlashState.On);
captureDevice.SetProperty(KnownCameraGeneralProperties.PlayShutterSoundOnCapture, false);
captureDevice.SetProperty(KnownCameraGeneralProperties.AutoFocusRange, AutoFocusRange.Normal);
seq.Frames[0].CaptureStream = imageStream.AsOutputStream();
await captureDevice.PrepareCaptureSequenceAsync(seq);
CaptureImage();
}
public async void CaptureImage() {
await seq.StartCaptureAsync();
// Set the stream position to the beginning.
imageStream.Seek(0, SeekOrigin.Begin);
MediaLibrary library = new MediaLibrary();
Picture picture1 = library.SavePictureToCameraRoll("image1", imageStream);
}
}
}
代码XAML文件
<phone:PhoneApplicationPage
x:Class="CapturingPhoto.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
shell:SystemTray.IsVisible="True">
<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent" Height="768" VerticalAlignment="Bottom">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!-- LOCALIZATION NOTE:
To localize the displayed strings copy their values to appropriately named
keys in the app's neutral language resource file (AppResources.resx) then
replace the hard-coded text value between the attributes' quotation marks
with the binding clause whose path points to that string name.
For example:
Text="{Binding Path=LocalizedResources.ApplicationTitle, Source={StaticResource LocalizedStrings}}"
This binding points to the template's string resource named "ApplicationTitle".
Adding supported languages in the Project Properties tab will create a
new resx file per language that can carry the translated values of your
UI strings. The binding in these examples will cause the value of the
attributes to be drawn from the .resx file that matches the
CurrentUICulture of the app at run time.
-->
<!--ContentPanel - place additional content here-->
<Canvas x:Name="VideoCanvas" RenderTransformOrigin="0.5,0.5" Canvas.ZIndex="0">
<Canvas.RenderTransform>
<CompositeTransform/>
</Canvas.RenderTransform>
<Canvas.Background>
<!-- The background contains the camera view finder
encapsulated in VideoBrush. -->
<VideoBrush x:Name="BackgroundVideoBrush" >
<VideoBrush.RelativeTransform>
<CompositeTransform x:Name="VideoBrushTransform" CenterY="0.5" CenterX="0.5"/>
</VideoBrush.RelativeTransform>
</VideoBrush>
</Canvas.Background>
</Canvas>
<Button x:Name="btn_Edit" Content="Capture" HorizontalAlignment="Left"
Margin="23,691,0,0" VerticalAlignment="Top"
Width="400" Click="onCaptureImage"/>
<!--Uncomment to see an alignment grid to help ensure your controls are
aligned on common boundaries. The image has a top margin of -32px to
account for the System Tray. Set this to 0 (or remove the margin altogether)
if the System Tray is hidden.
Before shipping remove this XAML and the image itself.-->
<!--<Image Source="/Assets/AlignmentGrid.png" VerticalAlignment="Top" Height="800" Width="480" Margin="0,-32,0,0" Grid.Row="0" Grid.RowSpan="2" IsHitTestVisible="False" />-->
</Grid>